:root{--card: #ffffff;--text: #16212f;--primary: #0ea5e9;--primary-hover: #0284c7;--success: #22c55e;--success-hover: #16a34a;--danger: #ef4444;--border: #dce3eb;--shadow: 0 14px 40px rgba(5, 31, 61, .08)}.app,.app *{box-sizing:border-box}.app{max-width:980px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:25px;overflow-x:clip}.dark .app{--card: #0f172a;--text: #e5e7eb;--border: #334155;background:var(--card);color:var(--text);border-color:var(--border)}.settings{display:flex;flex-direction:column;gap:8px;margin-bottom:20px;border-radius:10px}.dark .settings{background:#111827;border-color:#334155}.settings label,.block label{display:block;font-size:16px;color:#334155;font-weight:700;margin-bottom:10px}.dark .settings label,.dark .block label{color:#cbd5e1}.codec-row{display:flex;align-items:center;gap:10px;width:100%}.input-wrapper{position:relative;flex:1 1 auto}.settings input{width:100%;height:40px;border-radius:8px;border:1px solid var(--border);padding:0 35px 0 10px;font-size:14px;outline:none}.btn-mini-clear-input{position:absolute;right:12px;top:50%;transform:translateY(-50%);width:20px;height:20px;border:none;background:transparent;color:#9ca3af;font-size:18px;font-weight:400;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:color .18s ease;opacity:0;visibility:hidden;padding:0}.btn-mini-clear-input:hover,.dark .btn-mini-clear-input{color:#6b7280}.dark .btn-mini-clear-input:hover{color:#9ca3af}.input-wrapper.has-input .btn-mini-clear-input{opacity:1;visibility:visible}.dark .settings input{background:#0b1220;color:#e5e7eb;border-color:#334155}.settings input:focus,.input-wrap textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #0ea5e92e}.dark .settings input:focus,.dark .input-wrap textarea:focus{box-shadow:0 0 0 3px #38bdf840}.single-layout{display:grid;grid-template-columns:1fr;gap:18px}.textarea-wrap{position:relative}.input-wrap textarea{width:100%;min-height:150px;resize:vertical;border-radius:10px;border:1px solid var(--border);padding:12px 118px 12px 12px;font-size:15px;line-height:1.6;outline:none}.dark .input-wrap textarea{background:#0b1220;color:#e5e7eb;border-color:#334155}.dark .input-wrap textarea::placeholder{color:#64748b}.btn-mini{position:absolute;top:10px;right:10px;min-width:0;height:30px;padding:0 10px;border:1px solid #cbd5e1;border-radius:6px;background:#fff;color:#334155;font-size:12px;font-weight:600;line-height:1;z-index:2;box-shadow:0 4px 10px #0f172a29;opacity:0;visibility:hidden;pointer-events:none;transition:background .18s ease,border-color .18s ease,opacity .18s ease}.btn-mini-clear{top:46px;color:#b91c1c;border-color:#ef444466;background:#fffffff2}.textarea-wrap.has-text .btn-mini,.output-panel.has-text .output-actions .btn-mini{opacity:1;visibility:visible;pointer-events:auto}.btn-mini:hover{background:#f8fafc;border-color:#94a3b8}.btn-mini-clear:hover{background:#fff5f5;border-color:#ef44448c}.dark .btn-mini{background:#111827;color:#e2e8f0;border-color:#334155;box-shadow:none}.dark .btn-mini-clear{color:#fca5a5;border-color:#f8717180;background:#111827}.dark .btn-mini:hover{background:#1f2937;border-color:#475569}.dark .btn-mini-clear:hover{border-color:#f87171b3}.actions{display:flex;gap:12px;justify-content:flex-start;flex-wrap:nowrap;width:100%;min-width:0}.actions-row>button{flex:1 1 0;min-width:0;white-space:nowrap}.btn-encode,.btn-decode,.actions .btn-clear{display:inline-flex;align-items:center;justify-content:center;height:40px;min-width:126px;padding:0 14px;border:none;border-radius:8px;font-size:14px;font-weight:700;line-height:1;cursor:pointer;transition:background .18s ease,border-color .18s ease}.settings .btn-clear{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 14px;border:none;border-radius:8px;font-size:14px;font-weight:700;line-height:1;cursor:pointer;transition:background .18s ease,border-color .18s ease}.btn-content{display:inline-flex;align-items:center;justify-content:center;gap:6px;line-height:1}.btn-icon{width:16px;height:16px;display:block;flex:0 0 auto}.btn-icon-key{width:18px;height:18px;transform:translateY(-.5px)}.btn-encode{background:#1f2937;color:#fff}.btn-encode:hover{background:#374151}.btn-decode{background:var(--primary);color:#fff}.btn-decode:hover{background:var(--primary-hover)}.actions .btn-clear{background:#d05b60;color:#fff;border:1px solid #d05b60}.settings .btn-clear{background:#fff;color:#334155;border:1px solid #cbd5e1}.actions .btn-clear:hover{background:#b84b50}.settings .btn-clear:hover{background:#f8fafc;border-color:#94a3b8}.dark .btn-encode{background:#374151;color:#fff}.dark .btn-encode:hover{background:#4b5563}.dark .btn-decode{background:var(--primary);color:#fff}.dark .btn-decode:hover{background:var(--primary-hover)}.dark .actions .btn-clear{background:#d05b60;color:#fff;border-color:#d05b60}.dark .settings .btn-clear{background:#111827;color:#e2e8f0;border-color:#334155}.dark .actions .btn-clear:hover{background:#b84b50}.dark .settings .btn-clear:hover{background:#1f2937;border-color:#475569}.output-panel{border:1px solid var(--border);border-radius:10px;background:#eef2f7;padding:14px}.dark .output-panel{background:#111827;border-color:#334155}.output-head{display:flex;align-items:center;justify-content:flex-start;gap:10px}.output-panel{position:relative}.output-actions{position:absolute;top:42px;right:10px;width:48px;height:68px;z-index:10}.output-actions .btn-mini{position:absolute;top:0;right:0}.output-actions .btn-mini-clear{top:38px;right:0}.output-box{position:relative;width:100%;height:150px;resize:vertical;overflow:auto;border-radius:8px;background:#ffffffb3;border:1px dashed rgba(148,163,184,.5);padding:12px 70px 12px 12px}.output-text{height:100%;font-size:15px;line-height:1.6;color:#1f2937;white-space:pre-wrap;word-break:break-word}.dark .output-box{background:#0f172abf;border-color:#475569cc}.dark .output-text{color:#e5e7eb}.toast-wrap{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);z-index:9999;display:flex;flex-direction:column;align-items:center;gap:10px;pointer-events:none}.toast{width:max-content;max-width:min(92vw,420px);padding:20px 30px;border-radius:10px;background:#000c;color:#fff;font-size:14px;line-height:1.5;box-shadow:0 8px 22px #02061733;display:flex;align-items:center;gap:8px;transform:translateY(-8px);opacity:0;animation:toast-in .2s ease forwards}.toast-icon{width:16px;height:16px;flex:0 0 auto}.toast-icon.success{color:#22c55e}.toast-icon.error{color:#ef4444}.toast-text{color:#fff}.toast.hide{animation:toast-out .2s ease forwards}@keyframes toast-in{to{transform:translateY(0);opacity:1}}@keyframes toast-out{to{transform:translateY(-8px);opacity:0}}@media(max-width:640px){.app{padding:15px}.codec-row{flex-direction:row;align-items:center;flex-wrap:nowrap}.settings .btn-clear{width:auto;flex:0 0 auto;white-space:nowrap;padding:0 12px}.input-wrap textarea,.output-box{height:150px}.output-text{height:100%}.btn-encode,.btn-decode,.actions .btn-clear{min-width:0;padding:0 6px;font-size:15px}.actions{gap:8px}.btn-content{gap:4px}.btn-icon,.btn-icon-key{width:18px;height:18px;transform:none}.output-head{align-items:flex-start}}